MONGOC_APM_SE...LOGY_CLOSED_CB(3)

💅 mongoc_apm_set_topology_closed_cb(3) — yes bestie, we're talking libmongoc today 💅

okay so picture this: it's from libmongoc, and it's the little callback hook that fires when the driver stops monitoring a server topology and yeets its mongoc_topology_description_t into the void. it's giving cleanup era. it's giving "the party's over, everyone out." 🎀

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✨ SYNOPSIS ✨

typedef void (*mongoc_apm_topology_closed_cb_t) (
   const mongoc_apm_topology_closed_t *event);

void
mongoc_apm_set_topology_closed_cb (mongoc_apm_callbacks_t *callbacks,
                                   mongoc_apm_topology_closed_cb_t cb);

so like, the whole point: you get an event notification whenever the driver stops monitoring a server topology and destroys its mongoc_topology_description_t. one last goodbye text, basically 😭🦋

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🌸 PARAMETERS 🌸

• callbacks — a mongoc_apm_callbacks_t. that's the callback bag you're stuffing things into, bestie 🫶
• cb — a function to call with a mongoc_apm_topology_closed_t whenever the driver stops monitoring a server topology and destroys its mongoc_topology_description_t. yes, say it with me: stops monitoring ➡️ destroys the topology description ➡️ your callback gets a mongoc_apm_topology_closed_t ✨

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🦋 SEE ALSO 🦋

• Introduction to Application Performance Monitoring — go read it, iykyk 👑

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💖 AUTHOR 💖

MongoDB, Inc — the icons themselves 🌈

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🎀 COPYRIGHT 🎀

2009-present, MongoDB, Inc. periodt. no cap, that's the copyright line, we don't argue with it 💅

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lowkey reminder: this page is about getting told when the topology monitoring wraps up — don't go inventing extra behaviour for it, that's not the vibe 🙈

okay bye bestie, this was libmongoc version 2.5.6, dated Oct 09, 2026 — slay, drink water, and may your callbacks always fire exactly once when they should 💜🧚‍♀️